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Professor Beaker's Learning
Lab about Inclined Planes
Experiment description: A ramp, a load and a constructed scale are used to
demonstrate that an inclined plane makes it easier to elevate a load.
With the purchase of
reproduce pages only for the express use of students in his/her school.
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, the purchaser has permission to
The Author has made every reasonable effort to ensure that the experiment in this publication is safe when
conducted as instructed but assumes no responsibility for any damage caused or sustained while performing the
experiment. Children should be properly supervised by adults while undertaking the experiment in this publication.
Copyright 1996, Professor Beaker’s Learning Labs. All rights reserved. Ver. 3 National Edition
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Processes for Elementary Science addressed in this Lab
Professor Beaker has evaluated this Learning Lab with reference to scientific skills and processes.
Depending on how the educator chooses to present this Learning Lab, the following processes may be
addressed:
Observing: using one or more senses to obtain information directly.
Communicating: exchanging information orally or by writing, reading, illustrating.
Co-operating: students working together, sharing ideas and tasks to achieve a single goal.
Measuring: using a system of units (standard and otherwise) to give a description in terms of
quantity.
Inferring: making assumptions based on evidence from indirect observation.
Predicting: using previous experience and data to suggest what may happen in given
circumstances.
Interpreting: making a conclusion based upon available data.
What is an Inclined Plane?
Generally we do not think of an inclined plane or ramp as being a machine. However, an
inclined plane may be used to reduce the effort (force) needed to do a job. Therefore, it
is a simple machine. Raising any object a certain distance takes considerable work, but
by moving that object up a gentle slope, instead of lifting it straight up, less effort
(force) is needed. Think about why mountain roads wind around, rather than go straight
up the mountain, or why we use ramps to load heavy things onto trucks, or why we are
less tired after we walk up a gentle hill compared to a walk up a steep hill. These are all
examples of inclined planes.
Vocabulary for this Learning Lab
effort: This is the push or pull needed to move an object. It is equivalent to force.
inclined plane: This is a sloping surface used to make an object easier to elevate.
simple machine: This is a device that makes a job easier.
Word list
effort
ramp
inclined plane
simple machine
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 2
slope
steep
force
Teacher's Guide to the Experiment about Inclined Planes
Hypothesis
We think it will take less effort to pull the bag of marbles up a ramp than to lift the bag
straight up.
Teacher's Notes:
Even if the children choose a different hypothesis, it too will be tested by the experiment.
The aim of this experiment is to demonstrate that an inclined plane makes it easier to elevate a load.
Equipment
a plastic sandwich bag with a twist tie
35 marbles
string (30 cm long)
a stack of books
a long smooth board (or cookie sheet)
a rubber band scale (see instructions below)
Teacher's Notes:
The marbles can be replaced by any compact material weighing about 250 g (2 lb).
To make the rubber band scale
Equipment
a paper clip
tape
scissors
a medium weight rubber band
a 30 cm ruler
Method
1. Make one cut in the rubber band to make one long piece.
2. Tie a paper clip to one end of the rubber band.
3. Hold the paper clip so the tip is at the 9 cm mark on the ruler.
4. Drape the rest of the rubber band along the length of the ruler so its
end hangs over the end of
the ruler (the zero mark end).
5. While holding the paper clip at the 9 cm mark, tape the other end of the rubber band securely to
the back of the ruler. Don't stretch the rubber band.
) fix the load to the
To use the rubber band scale (it is used often in
paper clip on the scale. Hold the ruler by its edges and let the load pull the rubber band down the length
of the ruler. Read the number at the bottom tip of the paper clip. This is your measurement.
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Teacher's Notes:
The relationship between the amount of stretching of the rubber band and the amount of effort being expended may
not be immediately understood by the students, and should be discussed with them. The rubber band scale could be
prepared ahead of time and its use demonstrated. The instructions on how to make this scale are not included in the
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 3
student's experiment pages.
Method
1. Put the marbles into the sandwich bag and tie it shut with the
twist tie. This is your load.
2. Tie one end of the string to the paper clip on the scale.
3. Tie the other end of the string to the neck of the sandwich bag.
4. Stack the books on the end of a table.
5. Place the load on the table and slowly lift it to the height of the
stack of books by lifting the ruler (let the rubber band stretch
down the front of the ruler)
6. Observe how far the rubber band stretches. Find the number
by the tip of the paper clip on the scale and record it.
7. Place one end of the board on the books to make a ramp. The
other end is resting on the table top.
8. Place the load at the bottom of the ramp and
move it up the ramp by pulling the scale up the ramp
(let the rubber band stretch down the length of the
ruler).
9. Observe how far the rubber band stretches.
Find the number beside the tip of the paper clip on
the scale and record it.
Teacher's Notes:
A ramp with a lower slope will better demonstrate the difference between the effort required to raise a load using a
ramp and the effort required by lifting the load by hand. Keep this in mind when choosing the length of board and
the height of the stack of books. The board may be replaced by a smooth cookie sheet if you wish.
Observations
In the rubber band scale, how does the amount of stretch in the rubber band indicate the
effort being used? To what number on the ruler did the rubber band stretch when the load
was lifted straight up? To what number on the ruler did the rubber band stretch when the
load was pulled up the ramp?
Conclusions
The rubber band stretched farther when the load was lifted straight up compared to pulling
the load up the inclined plane. This shows that it took more effort (force) to lift the load
straight up than it took to move it up a ramp (inclined plane). It is easier to move
something up an inclined plane than it is to lift it straight up.
What Happened?
An inclined plane is a lot like a long set of stairs that are built with low steps. It is easier
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 4
to climb the stairs when the steps are low compared to climbing straight up a wall. It
Science Shorts about Inclined Planes
1. There are 6 simple machines. Can you name them?
The wheel and axle, pulley, screw, wedge, inclined plane and lever are all simple
machines.
2. Why do we use simple machines?
We use them because they make our physical work easier.
3. What is an inclined plane?
It is a flat surface that has been tipped. It can be a ramp of some sort, or a sloping
road.
4. Which simple machine do movers use to make moving
furniture easier?
They use an inclined plane (a ramp).
5. Most playgrounds have an inclined plane. Can you name it?
A playground slide is a kind of inclined plane. A seesaw looks like an inclined plane
but it actually works like a lever.
6. Which simple machine did the ancient Egyptians use to help
them build huge pyramids?
They used inclined planes to help move the big stones up to the top of the
pyramids. They probably used levers, too.
7. Which is easier - lifting a bike up a height or pushing it up a
ramp?
It is easier to push it up a ramp (inclined plane).
8. Which is easier - riding a bike up a steep hill or up a gentle hill?
It is easier to ride up a gentle hill because it is like an inclined plane.
9.Why do roads going up mountains usually wind around instead
of going straight up the side of the mountain?
It is easier for a car to go up a more gentle slope than up a steep one.
10. Name the simple machine that wheelchairs use instead of
going up stairs?
They use a wheelchair ramp which is really an inclined plane.
11. How do inclined planes affect your life?
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 5
Experiment about Inclined Planes
Level 1
Hypothesis
We think it will be easier to pull the bag of marbles up an inclined plane than to lift the bag
straight up.
Equipment
a plastic sandwich bag with a twist tie
35 marbles
string (about 30 cm long)
a stack of books
a long smooth board
a rubber band scale
Method
1. Put the marbles into the sandwich bag and tie it shut with the twist tie. This is
your load.
2. Tie one end of the string to the paper clip on the scale.
3. Tie the other end of the string to the neck of the sandwich bag.
4. Stack the books on the end of a table.
5. Place the load on the table and slowly lift it to the height of the
stack of books by lifting the ruler (let the rubber band stretch down the
front of the ruler)
6. Observe how far the rubber band stretches. Find the number by
the tip of the paper clip on the scale and record it.
7. Place one end of the board on the books to make a ramp. The other
end is resting on the table top.
8. Place the load at the bottom of the ramp and
slowly move it up the ramp by pulling the scale up the
ramp (let the rubber band stretch down the length of
the ruler).
9. Observe how far the rubber band stretches.
Find the number beside the tip of the paper clip on the
scale and record it.
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 6
name ______________
Level 1 - assessment
Inclined Planes
Circle the pictures that show an inclined plane being used to make
the job easier.
mountain roads
moving furniture
raising a wheelchair
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 7
Level 2
Experiment about Inclined Planes
Hypothesis
We think it will be ______________ (easier/harder) to pull the bag
of marbles up the inclined plane than to lift it straight up.
Equipment
a plastic sandwich bag with a twist tie
35 marbles
string (about 30 cm long)
a stack of books
a long smooth board
a rubber band scale
Method
1. Put the marbles into the sandwich bag and tie it shut with the twist
tie. This is your load.
2. Tie one end of the string to the paper clip on the scale.
3. Tie the other end of the string to the neck of the sandwich bag.
4. Stack the books on the end of a table.
5. Place the load on the table and slowly lift it to the height of the
stack of books by lifting the ruler (let the rubber band stretch down the
front of the ruler)
6. Observe how far the rubber band stretches. Find the number by
the tip of the paper clip on the scale and record it.
7. Place one end of the board on the books to make a ramp. The
other end is resting on the table top.
8. Place the load at the bottom of the ramp and
slowly move it up the ramp by pulling the scale up
the ramp (let the rubber band stretch down the
length of the ruler).
9. Observe how far the rubber band stretches.
Find the number beside the tip of the paper clip
on the scale and record it.
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 8
name ________________
Level 2-3 - assessment
Inclined Planes
Answer the questions. The words below may help you. Put your answers in the blanks.
When you are done solve the phrase at the bottom of the page.
1. The inclined plane belongs to a special
group of machines. What kind of
__ __ __ __ __ __
1
2
3
4
5
6
machines are these?
2. Does using an inclined plane make it
easier, or harder to lift
__ __ __ __ __ __
7
8
9 10 11 12
something up?
3. Moving companies use a kind of
inclined plane to move heavy
things. What are they called?
__ __ __ __ __
4. What is the name of the inclined
plane that you use to go up
inside a house?
__ __ __ __ __ __
13
18
5. What part of an experiment tells
you how to do it?
22
8
24
4
24
20
__ __
19
28
20
25
ropes
__ __ __
1
15
21
12
26
22
27
28
people
17
23
29
easier
__ __ __ __
7
27
25
13
6
__ __ __ y !
9
26
14
Experiment about Inclined Planes
©Professor Beaker’s Learning Labs. All rights reserved.
16
__ __ __ __ __ __
Words to choose from. Not all will be used.
simple
method
ramps
stairs
ladder
harder
__ __ __ __ __
19
14
SM-4 pg 9
Level 3
Hypothesis
(You will be lifting and pulling the sandwich bag of marbles up the slope. Which method of raising the
bag of marbles will take less effort - lifting straight up or pulling the bag of marbles up the inclined
plane?) ___________________________________________________________________________
_____________________________________________________
_____________________________________________________
Equipment
a plastic sandwich bag with a twist tie
35 marbles
string (about 30 cm long)
a stack of books
a long smooth board
a rubber band scale
Method
1. Put the marbles into the sandwich bag and
tie it shut with the
twist tie. This is your load.
2. Tie one end of the string to the paper clip on the scale.
3. Tie the other end of the string to the neck of the sandwich bag.
4. Stack the books on the end of a table.
5. Place the load on the table and slowly lift it to the height of the
stack of books by lifting the ruler (let the rubber band stretch
down the front of the ruler)
6. Observe how far the rubber band stretches. Find the number by
the tip of the paper clip on the scale and record it.
7. Place one end of the board on the books to make a ramp. The other end is resting
on the table top.
8. Place the load at the bottom of the ramp and
slowly move it up the ramp by pulling the scale up
the ramp (let the rubber band stretch down the
length of the ruler).
9. Observe how far the rubber band stretches.
Find the number beside the tip of the paper clip
on the scale and record it.
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 10
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_________________________________________________
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©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 11
Take home page
Inclined Planes
Today I learned about inclined planes!
I can show you if you will help me tie a thin stretchy rubber band to a fairly heavy object
(such as an apple in a plastic sandwich bag). Hold onto the rubber band and lift the object
up. See how much the rubber band stretches. Now, hold the rubber band and pull the
object up a gentle slope (an inclined plane) made with a smooth hard book cover (or a
smooth cookie sheet) raised about 4 or 5 inches (about 10 cm). How far did the rubber
band stretch this time?
------------------------------------------------------------------------------------An inclined plane is a sloping surface like a ramp. As your demonstration
showed, it takes less effort (force) to move an object up a ramp than it takes
to lift it straight up. An inclined plane is a simple machine.
The ancient Egyptians knew about inclined planes. They used them to help
them move massive stone blocks so they could construct the pyramids.
Moving companies today use ramps to move furniture. Wheelchairs need
ramps to get up heights. Mountain roads winding their way gradually up
mountains are really inclined planes.
The inclined plane, found everywhere, is being used to make many jobs
easier.
----------------------------
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Inclined Planes- take home page
Teacher’s name ____________________________ date: __________
I worked with _______________________________ (child’s name) to conduct the activity.
Did the child appear to understand what happened during the activity?
Was the experience pleasant for you both?
† yes † sort of † no
† yes † sort of † no
____________________________(name of person who did the activity with the child)
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 12
Word Search on Inclined Planes
Word List
easier
effort
force
inclined
machine
plane
ramp
simple
slope
stairs
up
s d f m q f o r c e
r r v a s i m p l e
i a m c n b v c x z
a m t h t r o f f e
t p j
i
l
j k f g d
s a q n c u p l p p
t r e e q p o i k l
z d e n i
l c n i a
c e p o l s b c v n
e a s i e r u y n e
©Professor Beaker’s Learning Labs. All rights reserved.
SM-4 pg 13